Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a25759b73e961f…

MALICIOUS

PDF

80.5 KB Created: 2021-03-15 08:29:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88fbc73d23905b12ac2523d79f33f25c SHA-1: e5ad40e860c3d83659d9eac24cc47ebe076d29e5 SHA-256: 80a25759b73e961f64a1638189db9fa0f58423f23c4df26ac96285b4d2fa9a4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation tactic. One of the embedded URIs points to a suspicious domain, and ClamAV detected it as a phishing trojan. The document body is heavily obfuscated and unreadable, but the presence of numerous external links indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://resalured.ru/wix?keyword=comic+con+2017+las+vegas+nv
    • http://artdebug.site/composite_shapes_perimeter_worksheeta4jzt.pdf
    • https://cdn-cms.f-static.net/uploads/4416661/normal_5feaf637081ca.pdf
    • https://puxipevabama.weebly.com/uploads/1/3/4/3/134308905/kivanemimi.pdf
    • https://static.s123-cdn-static.com/uploads/4385235/normal_5fee7b6a0ed73.pdf
    • https://fotawadibegul.weebly.com/uploads/1/3/1/1/131163643/f8d5af073.pdf
    • https://bogezemobazuv.weebly.com/uploads/1/3/1/8/131856224/9030761.pdf
    • http://thecet.xyz/principales_caracteristicas_de_los_modos_de_produccion_feudalismoa1oaf.pdf
    • https://static.s123-cdn-static.com/uploads/4444351/normal_5ff8ad68d0a78.pdf
    • https://static.s123-cdn-static.com/uploads/4450421/normal_5fc87473d3b7c.pdf
    • https://cdn-cms.f-static.net/uploads/4426699/normal_6047f41febcd3.pdf
    • https://fadesirowawilej.weebly.com/uploads/1/3/1/6/131606674/9722144.pdf
    • https://static.s123-cdn-static.com/uploads/4455376/normal_5fe2a97e718dc.pdf
    • http://epaytds.xyz/teliguzofifajuzeletesazixy81.pdf
    • https://static.s123-cdn-static.com/uploads/4374859/normal_5ffed391b6943.pdf
    • https://dalujukonuxuda.weebly.com/uploads/1/3/1/1/131163933/tovakene_pozubeb_tivujo.pdf
    • https://cdn-cms.f-static.net/uploads/4414487/normal_602127f848c77.pdf
    • https://gaditefu.weebly.com/uploads/1/3/2/7/132712385/rezijebanu_rawelanezi_wutowujisurulu.pdf
    • http://vipadminler.org/evenflo_maestro_sport_harness_booster_installationr2de2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_13feba4d21154565ba7ec8dfada4239a.pdf?index=true
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_e841284f3bc447c9955aaad934b8e3aa.pdf?index=true
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_d58d0e78f79b435a8deb5d055a05729c.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbf0.bin
5828b299f3d59119b628bd8d5c350a3b982626571f3bd33a160ec6efb356f325		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF0 5396 bytes
font_01_sfnt_off00010e4c.bin
bcef5706338318418ba871932c12e76a3711e5aa1f122418e0128a7b6aa1e985		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4C 11396 bytes

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